Tetra EasyBalance Reduces the need for frequent water changes, by creating and maintaining a healthy, balanced environment How to Use Add EasyBalance to the aquarium at a rate of 2.5ml per 10litres (2 gallons) every week, to replace regular water changes. Perform a 50% water change, using tap water conditioned with AquaSafe, at least once every 6 months. When using EasyBalance, ensure that the aquarium is properly aerated. EasyBalance is only suitable for use in mature tanks, with a fully functioning filter. It is still important to keep the gravel clean while using EasyBalance, through occassional siphoning with a TetraTec GC gravel cleaner.